Cosmetic brush



FIG. 1 is a top perspective view of a cosmetic brush showing my new design.

FIG. 2 is a top view of a cosmetic brush showing my new design; and,

FIG. 3 is a first side view of a cosmetic brush showing my new design.

The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a cosmetic brush, as shown and described. 